London (CNN) -- A British man charged with attacks on three websites is due to appear in court Thursday, Scotland Yard said.

Ryan Cleary, 19, is charged with mounting denial of service attacks on the websites of Britain's Serious Organised Crime Agency, the British Phonographic Agency and the International Federation of the Phonographic Industry.

The alleged attacks all took place between October and June, police said.

He is also accused of conspiring with other people to network computers in order to launch the attacks. Police have not said that anyone else has been arrested in connection with the attacks.

The computer hacking group LulzSec denied Tuesday that Cleary was a significant member of the group.

"Ryan Cleary is not part of LulzSec; we house one of our many legitimate chatrooms on his IRC server, but that's it," the group tweeted. "Clearly the UK police are so desperate to catch us that they've gone and arrested someone who is, at best, mildly associated with us. Lame."